ok I am also having the same issue for about 5 years first time it happened I put a voltage meter on the battery terminals is was like 12.0 volts which is bad I replaced the alternator worked fine bought one with life time warranty now 5 alternators later I still get squeal voltage also drops new belts there is no tensioner on 2000 spectra gsx I think the alternators are not what kia originally had installed next step is to buy a junkyard original kia alternator and see if my squeal disappears and the last alternator one store location said it was something else other store tested alt engine off and said bad voltage regulator I am to confused about this squeal I hope this makes sense its my first post ty